11. What is the average speed of the moving object between 20 and 60 seconds? 1,000 800 200 0 40 80 120 Time (s) 12. An airplane accelerates on a straight runway from O to 100 km/s in 6s. What is the airplanes acceleration? 13. After 3. O s, JJ was running at 1.2 m/s on a straight path. After 7.0 s, he was running at 2.0 m/s. What was his acceleration? 14. A ruler is on the table with the higher numbers to the right. An ant crawls along the ruler from 6 cm to 2 cm in 2 seconds. Describe the ant's distance, displacement, speed and velocity. (Draw a picture if necessary)

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

would be false hope this out

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.